Boiler for heating systems or similar purposes



Nov. 29, 1927.

M. TREscl-low BO-IBER FOR HEATING SYSTEIS OR SIIILAR `PURPOSES FiledApril' 23, 192s Figi `Q TT ORNEYS Patented Nov. 29,1927.

UNITED 1 STATES iss-iras c MICHAEL rnnscnow', or Coram-menu, DENMARK. l

Boitier non nna'rne svsfrnivrs on SIMILAR iennrosns.y

' Ap'piicatlon flied apra es, i926, sensi No. 105,328,milniienmark'iaay16,1925.

It is well known tl at the amount of ,heatVV given oit' by the .heatingsurface of a'boiler than in hot-water boilers, as the latter will have avmuch lower Vmean temperature of Athe water, but in spite of vthis tactthe heat transmission per unit (sq. ft.) ot' heating surface of ahot-water boiler will, it' anything, be less than the heat transmissionot the corresponding steam-heating boiler. T his is due to the fact thatordinarily there will always be a lively circulation ot the water in asteam boiler on account o'll the gene ation of steam which takes placenear the parts of the heating surface which are subjected to the mostintense heat, while in the 'ordinary hot-water boiler,-in which no steamgeneration takes place-there will be practically no circulation, thevelocity ot the water cooled-off inthe heating system being lost as thewater enters the boiler, and owingto the comparatively great sectionalarea of same, the water passes the heating lsurface at a very low speed(generally on the counter-current principle). As a rule there will be nolocal circulation.

r)he tact that the water in ya hotwater boiler is relatively stagnanthas Ylor such boilers not only the drawback that the heat transmissionof the heating surface will be less than necessary, but it entailsfurther the drawback that the parts ot' the heating surface which areespecially exposed to the lire are liable to become overheated, whichagain may result in leakage. rlhis is,lfor instance, a common occurrencein hot-water (smoke) tube-boilers, where the tube-plate facing thecombustion chamber, particularly in vertical boilers where thetube-plate is arranged horizontally, very often due to overheating willbecome leaky at the places where the tubes are expanded into the plate,and these frequent leakages will result in a too rapid destruction ofboth vtubes and plates, even if the tubes are re-expanded.

The use of yvertical (smoke) tube-boilers has been greatly restricted bythese drawbacks, although it often would prove con- Vvenient to use suchboilers, as they offer advantages in economy in floor space. Inhorizontal tube-boilers certain devices have been agplied'toA setup .arapid circulation of the -water near-the--exposed tube-plate of the xboiler. Such; well `known devices, however,v

can not be applied to verticaltube-boilers."

VThe drawing shows an' Vexamplefof how the invention may beA applied toa hot-water boiler of the above mentioned kind and provided witha t'uelmagazine.

`Fig. l shows a vertical section oi the boi-ler according to theinvention, and

F ig. 2 a section following the line A-B in Fig. l'.

As an example t-he boiler is shown having a tire space with slopinggrates for thel combustion ot' bituminous fuel, but a horizontal gratemay also be used.

By a partition b with double partitionwalls the fire box a is dividedinto two portions, tlie lire box proper with the combustion chamber 0,and the smoke box (l. AS will be seen from Fig. 2 the partition b isclosed at both ends, forming a flattube theV lowei' end et which, inthepresent design, is shown entering the lower part ot' the boiler, i. e.,in the Water space between the bottom plate of the tire box a and thebottom plate e of the boiler` proper, and the upper end of which isentering the upper part of the boiler right above the lower tubeplateThe partition Z9 may be arranged either vertically or inclined. Throughthe smoke tubes g thegases pass from the combustion chamber c to aheader i, down through the boiler tub-es z', to the smoke box Zandheiice to the chimney.

The water in the partition L, above the upper entrance of which a` guideplate 7;, Fig. l, may be provided, will become intensively heated,exposed as it is to the heat from two sides, from the combustion chamberc and the smoke box d, thereby causing a large volume of water,eventually intermixed with steam bubbles to flow from the bottom of theboiler upwards through the partition b to the space abovethe nre box,where it is distributed across the'tube-plate, thus preventingoverheating of the saine. The downward circulation of the boilerwaterwill mainly take place at the back front, of the boiler, between thebackplate ot' the latter and thevback plate of the fire box (smoke box),asindicated by the arrow :c in Fig. 1. p

The cooled-0H return Water from the heating system may, forinstance,.enter the boiler in the rear end, and the water heated ink thelll) boiler should preferably leave thel boiler; from the'upp-er plate,through one or more flow pipes l.

Having thus described my invention, what I claim isz l. Vertical boilerorheatingsysteins hav ing upright smoke tubes asy heating Surface andthe fue bex. divided inte acombustioii, chainber and a vsmoke box bymeans of a partition"consisting- "or-t'worspacedL walls, said partitionforining a direct communication between the upperandflowei'lpartsiofth'eboiler.

naine to this specification.v 2. Boiler for heating systeins having,Ver-y tween the combustion chamber and smoke box of the boiler., said,partition forming a communication between the upper and lower parts oftlie boiler, aguide plate provided above the entrance of `the partitioninto the upper parteii the boiler, saidl plate being positioned todistribute the water rising in the partition across the inostintensively heated portion of the tube plate.

In testimony whereof I have signed iny MICHAEL rREsoi-iow.

